I love the camera reviews that are done by the Camera Store on YouTube. Their spokesperson, Chris Nichols, is bright, fun, informed and very good in front of a video camera. For most cameras they are definitely part of the information well I go to with my bucket to find out about new camera capabilities.

In the video I linked to above they test the continuous auto focus, tracking autofocus and point to point, single autofocus of the top four mirror free cameras: The Sony A6000, the Fuji XT-1, the Olympus EM-1 and my personal favorite, the Panasonic GH4. Their control and comparison camera is the current king of the hill for action shooting, the Nikon D4s.